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Gitzo 1780QR Series 1 centre ballhead with quick release, spring assisted double lock, separate pan lock, bubble level. Like new, has seen minimal use, lists for $299.99.
http://www.henrys.com/10504-GITZO-GH1780QR-BALL-HEAD-W-QR.aspx
I also have a second quick release plate - $25 (lists for $45).